Beam-compasses



(No Model.)

W. H. HATTEL.

BEAM UOMPASSES No. 455,461. Patented July 7; 1891.

Fig}.

UNITED STATES PATENT OFFICE.

IVILLIAM H. HA'ITEL, OF DAYTON, OHIO.

BEAM-COMPASSES.

SPECIFICATION forming p art'of Letters Patent No. 455,461, dated July 7,1891.- Application filed January 2Q,1 89l. serial No. 378,394. (Nomodel.)

beam-compasses; and the objects in view are to provide a cheap andsimple arrangement for adapting the compasses for finer adjust ment.

With the above objects in view the invention consists in certainfeatures of construction hereinafter specified, and particularly pointedout in the claims.

Referring to the drawings, Figure 1 is a side elevation ofbeam-compasses constructed in accordance with my invention. Fig. 2 is avertical longitudinal section of the movable leg and connection. Fig. 3is an end elevation thereof.

Like numerals indicate like parts in all the figures of the drawings.

1 designates the beam of the compasses, rectangular, as is usual, andupon the beam are mounted the two movable boxes of the leg.

As my invention relates wholly toimprovements upon that leg of thecompasses usually adjusted, all reference hereinafter made to the legand box relates thereto. The box 2 is provided with the usuallongitudinal opening 3 for the reception of the beam 1, and at its rearend is provided with a pair of depending transversely-disposed andcentrally-perforated bearing-ears 4. Near theopposite end of the boxthere is formed a pair of depending bearing-lugs 5, disposed at a rightangle to the ears 4 and provided with registering openings 6, throughwhich is passed a bolt or screw 7. Upon the bolt or screw there ispivotally mounted a knuckle 8, the same being provided at its lower endwith at-hreaded socket 9 and at its upper end with a bifurcation or slot10, the opposite walls of which are perforated for the reception of atransverselydisposed rivet 11.

12 designates the point or leg, terminating at its upper end in thethreaded reduced tenon 13, removably inserted in the threaded socket9'of the knuckle.

A rod 14 is mounted for movement in the bearing-perforations in the ears4 and has its outerend terminating in a perforated eye 15, which takesbetween the bifurcations of the knuckle and is pivoted thereinbetween bymeans of the rivet 11. The free end of the rod is threaded and passedthrough the perforations of the ears 4, and also through a milledthumb-nut 16, located between the ears 4 and having a central threadedopening for the reception of the rod. The bottom of the box is providedat opposite ends of its bore with upwardly-disposed lugs 3, betweenwhich to the bottom is secured the threaded stud 18, upon which isthreaded the milled clamping-nut 19, the periphery of which extendsthrough opposite openings formed in the side walls of the box.

In operation, in order to set the leg 12, the nut 19 is operated so asto approximately set the leg, after which it is tightened by means ofthe nut-19 clamping against the under side of the beam 1. It now simplyremains to operate the nut 16, and thus through the medium of the rod 14swing the leg in either direction and in accordance with the directionof rotation of the nut, and in this manner exceedingly fine adjustmentsmay be obtained with facility.

Having described my invention, what I claim is 1. In beam-compasses, thecombination, with the beam, of a box adjustably mounted thereupon andprovided at one end with a pair of transversely-disposed bearing-earsand at its opposite end with a pair of l0ngi tudinally-disposeddepending and perforated bearing-lugs, a knuckle mounted between thelugs, having its upperend bifurcated and its lower end provided with athreaded socket, a pivot-bolt passed through the knuckle and the lugs, arod having an outerthreaded end mounted in the perforations of thebearingears and having its inner end terminating in a perforated eyepivoted between the bifurcations of the knuckle, and a thumb -nutmounted on the rod between the ears, sub-v stantially as specified.

2. In beam-compasses, the box 2, adapted to be mounted on the beam andprovided with a leg 12, pivoted between its ends, the rod 14., pivotallyconnected with the upper end of the leg, the thumb-nut mounted thereon,and bearings for the screw at each side of the nut, as set forth. v

3. In beam-compasses, the box having a leg and a beam-receiving boreterminating atits ends and at its bottom in shoulders 3% combined withthe beam, the rigid threaded stud rising from the bottom of the borebetween the shoulders, and the milled nut mounted on the stud andadapted to bear upon the under side of the beam, substantially as speci-1o fied.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

WILLIAM H. HATTEL.

Witnesses:

GEORGE TRIMBACH, JACOB STEPHANS.

